verb

• (transitive) To cross out something with lines etc.
  "A deed may be avoided by delivering it up to be cancelled; that is, to have lines drawn over it in the form of latticework or cancelli; the phrase is now used figuratively for any manner of obliterating or defacing it."
• (transitive) To invalidate or annul something.
  "He cancelled his order on their website."
• (transitive) To mark something (such as a used postage stamp) so that it can't be reused.
  "This machine cancels the letters that have a valid zip code."
• (transitive) To offset or equalize something.
  "The corrective feedback mechanism cancels out the noise."

noun

• (US) A cancellation.
• (US) A cancellation.
• (obsolete) An enclosure; a boundary; a limit.
  "A prison is but a retirement, and opportunity of serious thoughts, to a person whose spirit[…]desires no enlargement beyond the cancels of the body."
• (printing) The suppression on striking out of matter in type, or of a printed page or pages.